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155:, needed a different exhaust nozzle areas for running properly at each of the operating regimes: start/idle, climb, high speed, high altitude. A nozzle with a fore/aft-translating "bullet" restrictive body in the center was chosen for each design. It provided area control with relatively simple actuation and matched the annular shape of the turbine exhaust.
49:. The stem of the valve runs back through the body of the nozzle body to a "trigger", normally a long lever running down the back of the nozzle assembly. A spring keeps the valve pressed against the opening under normal use, thereby providing a failsafe cut-off that stops the flow of water when the nozzle is dropped.
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The shaping of the plug and the nozzle opening allows the angle of the ring to be adjusted. Normally this is shaped so that when the plug is pulled back toward the opening it both partially cuts off the water flow, as well as causing it to spread out to the widest possible angle. This can be used for
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with a poppet-shaped plug to allow the pattern of the rocket exhaust to be changed. This is used to adjust for changes in altitude; at lower altitudes the plug is pulled back to cause the exhaust to spread out, while at higher altitudes the lower air pressure will cause this to happen naturally. An
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D supersonic airliner. The center-body was perforated and compressed air forced into the exhaust jet through the perforations to attenuate the noise. Weight and cooling are typical concerns with aircraft plug nozzles. A plug nozzle design evaluated at the
National Gas Turbine Establishment was
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When water is supplied to the hose, it flows through the nozzle body to the opening, where it would normally flow straight forward in a stream. Just after leaving the opening it encounters the plug, which deflects the water sideways through an angle. After travelling a short distance the water
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The jet-engine plug nozzle has its origins in rocketry but has also been studied over the years, but not used, for supersonic cruise aircraft such as the Boeing SST, the proposed
General Electric Variable Cycle Engine, with its acoustic plug nozzle, and Concorde. However, it was used for the
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encounters the outside of the nozzle opening, which deflects it forward again. This two-step process causes the water to be ejected in a ring-shaped pattern, which causes less water to strike any one location, and thereby reduces erosion while also making it easier to water larger areas.
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rejected for the
Concorde engine due to the weight penalty from the required variable features and concerns about adequate plug cooling during reheat operation. Plug nozzle model tests have shown reduced noise levels compared to traditional con-di nozzles.
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Propelling nozzles for subsonic aircraft have used a center-body/bullet/cone to give the nozzle exit area required to set an axial compressor running-line correctly on its map. The first operational German turbojet engines with axial compressors, the
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trigger nozzles are a simple example of the plug nozzle and its method of operation. In this example the nozzle consists of a conical or bell shaped opening with a plug on a movable rod positioned in front of the nozzle. The plug looks similar to a
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alternative construction for the same basic concept is to use two nozzles, one inside the other, and adjust the distance between them. This pattern has the advantage of better control over the exhaust and simpler cooling arrangements.
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missile and the Tu-144 airliner. The plug / "external-expanding" nozzle has a central plug and a freely-expanding supersonic jet rather than a diverging cone surface to contain the internal supersonic expansion as in a delaval
57:"misting" plants. When the trigger is pushed down further, the plug moves away from the opening, causing less blockage and disruption of the flow, ultimately allowing the water to form back into a stream.
88:, with a wide base and long tapering forebody. However, the "spike" portion can be cut off with only minor effects on performance, leaving just the base section. This looks very similar to a common
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missile used a plug nozzle which performed better over the missile's flight envelope than either a convergent or a con-di nozzle. A translating center-body was used on the non-afterburning
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Confusingly, the term "plug nozzle" may also be used to refer to an entirely different class of engine nozzles, the aerospikes. In theory the aerospike should look roughly like a
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which includes a centerbody or plug around which the working fluid flows. Plug nozzles have applications in aircraft, rockets, and numerous other fluid flow devices.
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A Case Study By
Aerospatiale And British Aerospace On The Concorde, Rech and Leyman, AIAA Professional Study Series, p. 6-10
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Typical plug-nozzle garden sprayer with a trigger-pull lever (at the back) to control the position of the plug and valve.
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Jet
Propulsion Progress, First edition, Neville and Silsbee, McGraw-Hill Book company, Inc. New York and London, 1948
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189:, Jeff Scott, Fall 1999. This paper gives an extensive review of the various altitude compensating nozzle designs.
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Journal of Sound and
Vibration Volume 206, Issue 2, 18 September 1997, Pages 169–194.
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363:"Exhaust Nozzles for Propulsion Systems With Emphasis on Supersonic Cruise Aircraft"
259:"Exhaust Nozzles for Propulsion Systems with Emphasis on Supersonic Cruise Aircraft"
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96:, and leads to widespread use of the term "plug nozzle" for this design as well.
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Tupolev Tu-114' Gordon, Komissarov and
Rigmant, Schiffer Publishing Ltd. 2015,
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232:"Plug nozzles: The ultimate customer driven propulsion system"
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Similar to the garden hose example, plug nozzles use a shaped
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The
Engines of Pratt & Whitney, Jack Connors 2010,
215:. Pratt & Whitney Rocketdyne. Archived from
108:Sectioned Jumo 004 exhaust nozzle, showing the
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207:O'Leary, R.A.; Beck, J. E. (Spring 1992).
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130:aircraft engine used in the supersonic
433:: CS1 maint: archived copy as title (
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269:from the original on October 5, 2021
238:from the original on October 5, 2021
230:Aukerman, Carl A. (August 1, 1991).
65:Plug nozzles belong to a class of
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257:Stitt, Leonard E. (May 1, 1990).
383:from the original on 17 May 2010
361:Stitt, Leonard E. (May 1990).
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67:altitude compensating nozzles
124:convergent-divergent nozzle
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370:Reference Publication 1235
246:– via ntrs.nasa.gov.
100:In aircraft and missiles
128:Pratt & Whitney J52
138:A engine used for the
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482:Spacecraft propulsion
126:(con-di) nozzle. The
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187:Aerospike Engine
175:Expanding nozzle
170:Aerospike engine
136:Kolesov RD-36-51
132:AGM-28 Hound Dog
119:AGM-28 Hound Dog
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47:poppet valve
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165:Bell nozzle
42:garden hose
18:plug nozzle
476:Categories
420:2018-07-25
299:2018-07-25
194:References
90:drain plug
61:In rockets
393:(42.1 Mb)
213:Threshold
71:aerospike
429:cite web
378:Archived
308:cite web
273:July 25,
267:Archived
242:July 25,
236:Archived
159:See also
149:Jumo 004
487:Nozzles
387:14 July
351:, p.188
334:, p.276
153:BMW 003
110:Zwiebel
40:Common
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22:nozzle
414:(PDF)
407:(PDF)
381:(PDF)
366:(PDF)
86:lance
28:Hoses
435:link
389:2012
374:NASA
345:ISBN
328:ISBN
314:link
275:2018
244:2018
151:and
94:bung
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